Elevator.



S. V. TRENT.

ELEVATOR. APPLICATION FILED an. 1a, 1901.

900,237, Patented Oct. 6, 1908.

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. ATTORA IEY S. V. TRENT.

ELEVATOR. APPLICATION nun M11. is, 1907;

Patented 0ct.6,1908.

2 SHEETS-SHEBT 2.

IN VEN TOR.

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siMEoN- v. TRENT, OF sALT LAKE CITY, UTAH.

ELEVATOR.

Specification of Letters Patent.

Patented Oct. 6, 1908.

Application filed January 16, 1907. Serial No. 352,633.

To all whom it may concern:

Be it known that I SIMEoN V. TRENT, a resident of Salt Lake City, SaltLake county, and State of Utah, have invented a new and usefulImprovement in Elevators Used for Raising or Lowering Heavy Articles, ofwhich the following is a s ecification.

My invention re ates to that class of elevators or lifts that handleheavy and cumbersome articles, where the elevator may or may not bestationary, and for which the change in position is vertical and oflimited distance. I attain these objects by the improvements shown inthe accompanying drawing, in which similar letters of reference indicatelike parts throughout the several figures:

Figure 1 is a side elevation with the elevator at its lowest point. Fig.2is a side elevation with the elevator-partially extended. Fig. 3 is anenlarged sectional view of one of the traveling nuts. Fig. 4 is anenlarged sectional view of one of the reciprocating blocks. Fig. 5 is anenlarged transverse section of the latform M, showing roller 0 inposition. ig. 6, is a transverse section of the base A, with one of therollers O in position. 7

The base or frame A, has mounted thereon in bearings I, I, athreadedhorizontal shaft B, one end threaded with right hand, and the other withleft hand threads. On each end of the shaft A, is secured a bevel-gearwheel G, the teeth of which mesh with beveled pin ions J, J, that arecarried by short shafts N, N, that are mounted in bearings L, L. Theshafts N, N, are provided with hand wheels K, K. The threads on theshaft B engage the traveling threaded nuts D, and E, that are alike inconstruction, except that D has right hand, and E has left hand threads;to the lower end of each of said nuts, is fitted a roller 0 that is madeto operate in a groove or run-way in the top of the base A. The grooveswith which the rollers O cooperate prevent any tendency of the nuts Dand E to rotate or the blocks H to be displaced laterally, whereby thejoints of the toggle arms would operate improperly not be broken.

To the upper end'of the traveling nuts D, and E, are pivoted one end ofthe toggle arms that are made to operate on a center fulcrum c, andpivoted together by pins 6. The upper ends of the upper pair of arms aare pivoted to the lower ends of slidable blocks H, H, that are made tooperate on a horizontal shaft C, that is carried by the dependingbearings I, I, on which is secured the platform M.

The slidable blocks H, H, are provided with rollers O, O, that operatewithin a grooved recess in the under side of the platform M.

The threaded shaft B, and horizontal shaft 0, are each supported nearthe middle by bearings F, F.

Any form of motive power may be used, that of hand power being shown.

Power being applied to the shafts N, N, motion is imparted through thebevel pinions J, J and bevel gear wheels G, G, to the threaded shaft B,the threads on which en gage thethreads in the traveling threaded nuts Dand E, that are drawn together and the arms a, 0., etc. assume thedifferent angles shown'in Fig. 2, and the slidable blocks H,H, are drawntogether and the platform M,

raised upwardly. The arms a, a, etc. may

be forced to assume the positions and angles shown by dotted lines as,r, y, y, and the rollers O, O, aid in supporting the shafts B, and C.

The drawings shown, are for a stationary elevator with a guidedplatform.

For a portable elevator, the parts shown are to be duplicated, exceptthe platform M, which, in that case, is sup orted by du licatemechanism, and each s1 e receives t e action of the mechanism of itsrespective side, both sides acting in unison; and the whole mounted ontrucks, wheels and other means of conveyance.

Having thus described my invention, I claim and desire to secure byLetters Patent:

A lazy tongs elevator comprising a base having a groove on its uppersurface, end and intermediate bearings supported upon said base, a rightand left threaded power shaft journaled in said bearings, traveling nutsmounted upon the threaded portions of said shaft, anti-friction rollersj ournaled in the lower ends of said nuts and operating in said grooveto prevent tendency of the nuts to rotate, a series of pairs of togglearms pivoted to the upper ends of said nuts, a vertically forin groove,said blocks being pivotally c611 movable platform having a groove on itsnected to the upper ends of the toggle arms, lower'surface, end andintermediate supports i and means to rotate the power shaft. secured tothe lower surface of the platform, SIMEON V. TRENT.

5 a stationary shaft supported by said sup- Witnesses:

ports, blocks slidable on said shaft, means R. W. GORDON, whereby saidblocks cooperate with said plat FLORENCE I. HULL.

